Description Deck Filler Black Nylon 38mm Hose Fuel Black nylon deck filler Finger grip cap with ‘O’ ring creates an umbrella cover over base to prevent contaminant entering. Security chain to prevent cap falling overboard. Caps marked ‘Fuel’ or ‘Water’.   Protrusion: 18mm Intrusion: 67mm Cap Diameter: 90mm Mount Screws: 5mm c/s